Good Manners and Form (Al-Adab)

Bukhari :: Book 8 :: Volume 73 :: Hadith 32

Narrated Usama bin Zaid:

Allah's Apostle used to put me on (one of) his thighs and put Al-Hasan bin 'Ali on his other thigh, and then embrace us and say, "O Allah! Please be Merciful to them, as I am merciful to them. "